feat(index): 添加后退按键自定义处理逻辑

- 在首页组件中添加 onBackPress 方法
- 当详情页显示时，按后退键关闭详情页
- 否则，执行默认后退行为（退出应用）

src/pages/index/index.ux

@@ -9,7 +9,7 @@
     <div class="header-divider"></div>
     
     <!-- 账户列表 -->
-    <list class="totp-list" style="position: absolute; top: 70px; bottom: 70px; left: 2px; right: 2px; width: 208px;">
+    <list class="totp-list" style="position: absolute; top: 70px; bottom: 70px; left: 2px; right: 2px; width: 188px;">
       <list-item class="totp-item" style="height: 115px; margin-bottom: 10px; background-color: #1a1a1a; border-radius: 15px; border: 1px solid #333; flex-direction: column; justify-content: space-between; padding: 8px;" type="account" for="{{totpList}}" onclick="showDetail($idx)">
         <div style="flex-direction: column; width: 100%; margin-bottom: 8px;">
           <text style="font-size: 24px; color: #fff; font-weight: bold; margin-bottom: 3px; text-align: left; width: 100%; line-height: 26px;">{{$item.name}}</text>
@@ -30,7 +30,7 @@
     <!-- 底部弧形倒计时进度条 -->
     <div class="countdown-container" show="{{totpList.length > 0}}">
       <!-- 弧形进度条 -->
-      <progress style="position: absolute; left: 0px; bottom: 10px; center-x: 106px; center-y: 0px; width: 212px; height: 100px; radius: 100px; start-angle: 240deg; total-angle: -120deg; stroke-width: 8px; background-color: rgba(255, 255, 255, 0.2); color: {{progressColor}};" percent="{{timeProgress}}" type="arc"></progress>
+      <progress style="position: absolute; bottom: 10px; center-x: 96px; center-y: 0px; width: 192px; height: 100px; radius: 96px; start-angle: 240deg; total-angle: -120deg; stroke-width: 8px; background-color: rgba(255, 255, 255, 0.2); color: {{progressColor}};" percent="{{timeProgress}}" type="arc"></progress>
       <!-- 倒计时文字 -->
       <text class="countdown-text" style="position: absolute; bottom: 35px; left: 0px; right: 0px; text-align: center; font-size: 20px; font-weight: bold; color: {{textColor}}; transition: color 500ms ease-out;">{{timeLeft}}秒</text>
     </div>
@@ -716,6 +716,17 @@ export default {
     vibrator.vibrate({
       mode: 'short'
     })
+  },
+
+  onBackPress() {
+    console.log('触发：onBackPress')
+    // 如果详情页打开，则关闭详情页返回列表
+    if (this.showDetailPage) {
+      this.hideDetail()
+      return true  // 自己处理，不执行系统默认返回
+    }
+    // 否则执行系统默认返回行为（退出应用）
+    return false
   }
 
 }
@@ -757,8 +768,8 @@ export default {
 .header-divider {
   position: absolute;
   top: 55px;
-  left: 20px;
+  left: 15px;
-  right: 20px;
+  right: 15px;
   height: 1px;
   background: linear-gradient(to right, transparent, #333, transparent);
   flex-shrink: 0;
@@ -821,7 +832,7 @@ export default {
 
 .detail-content {
   flex: 1;
-  padding: 40px 20px 20px 20px;
+  padding: 40px 15px 20px 15px;
   flex-direction: column;
   align-items: center;
   justify-content: center;
@@ -847,12 +858,12 @@ export default {
   align-items: center;
   justify-content: center;
   margin-bottom: 25px;
-  padding: 20px;
+  padding: 15px;
   background-color: #1a1a1a;
   border-radius: 12px;
   border: 2px solid #333;
   height: 120px;
-  width: 170px;
+  width: 150px;
 }
 
 .detail-code-row {
@@ -863,30 +874,30 @@ export default {
 }
 
 .detail-code-digit {
-  width: 30px;
+  width: 28px;
-  height: 50px;
+  height: 45px;
   margin: 0 1px;
   justify-content: center;
   align-items: center;
 }
 
 .detail-code-num {
-  font-size: 32px;
+  font-size: 28px;
   color: #00ff88;
   font-weight: bold;
   font-family: monospace;
   text-align: center;
-  line-height: 40px;
+  line-height: 35px;
 }
 
 .detail-code-single {
-  font-size: 32px;
+  font-size: 28px;
   color: #00ff88;
   font-weight: bold;
   font-family: monospace;
   letter-spacing: 3px;
   text-align: center;
-  line-height: 40px;
+  line-height: 35px;
 }
 
 .detail-time {